... 3)For the aged. 4) CE 5) Water proof with IP65 wireless door bell with hearing aid, CL-6011 Technical Specifications1. CE (EMC ... Audio Intercom2,Wireless digital technology3,Use the handset to talk with outdoor unit4,Use the handset to unlock the door5,Volume ... Aid speaker, easy use for senior people8,High quality intercom with communication (range: Indoor 35~50 meters)